Reduces the visibility of all fields to private and create setters/getters
when necessary. Exceptions are fields with GuiSync as these need to be
public.
Reduces the visibility of internal methods to private/protected/default when possible.
Removes the usage of the old methods, since they were pretty, but not applicable for our use case. The displayed strings are determined by the size of the to be rendered string. Now the algorithm tries to use as much width as possible before trying to trim it down.
Added tests to reflect the changes and expected behaviour. Also using specific interfaces for the corresponding behaviour to shield from potential calls to the underlying enum singleton implementation.
